A person suffers punctures in his chest cavity in an accident, without any damage to the lungs, its effect could be

1.  reduced breathing rate

2.  rapid increase in breathing rate

3.  no change in respiration

4.  cessation of breathing

Mark the true statement among the following with reference to normal breathing

Mark the correct pair of muscles involved in the normal breathing in
humans.

1.  External and internal intercostal muscles
2.  Diaphragm and abdominal muscles
3.  Diaphragm and external intercostal muscles
4.  Diaphragm and intercostal muscles